Fig. 3. (A) Dorsal view of skull of Chelus fimbriatus. The arrows indicate the directions of forces produced during contraction of the jaw adductor muscles, the shaded areas indicate the extent of the muscles and the thickness of the arrows reflects the relative forces of the muscles; the resulting forces produced by the muscles shown on each side are indicated next to the skull. amext_med, pars medialis of external adductor; amext_prof, pars profunda of external adductor; amext_sup, pars superficialis of external adductor; ampost, posterior adductor; pt, pterygoid muscle (internal adductor). (B) Lateral view of the skull. The courses of the major visceral muscles connected to the hyoid are shown by arrows. The resulting forces produced during contraction of the muscles are shown at the bottom. bm, branchiomandibular muscle; chy, coracohyoid muscle; ghyI and ghyII, geniohyoid muscles I and II.

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